i40evf: Fix client header define

Fix up the VF client header define, since it is the same as the PF
client header.
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>

drivers/net/ethernet/intel/i40evf/i40evf_client.h

 /* SPDX-License-Identifier: GPL-2.0 */
 /* Copyright(c) 2013 - 2018 Intel Corporation. */
 
-#ifndef _I40E_CLIENT_H_
-#define _I40E_CLIENT_H_
+#ifndef _I40EVF_CLIENT_H_
+#define _I40EVF_CLIENT_H_
 
 #define I40EVF_CLIENT_STR_LENGTH 10
 
@@ -166,4 +166,4 @@ struct i40e_client {
 /* used by clients */
 int i40evf_register_client(struct i40e_client *client);
 int i40evf_unregister_client(struct i40e_client *client);
-#endif /* _I40E_CLIENT_H_ */
+#endif /* _I40EVF_CLIENT_H_ */